JPH0171009U

JPH0171009U -

Info

Publication number: JPH0171009U
Application number: JP1987166064U
Authority: JP
Priority date: 1987-10-28
Filing date: 1987-10-28
Publication date: 1989-05-11

Description

[Brief explanation of the drawing]

第１図は本考案の１実施例の先端部の平面図、
第２図は従来例を示す図である。１……主切刃、２……外周逃げ部、３……副切
刃、４……副溝、５……主溝、６……シンニング
、７……シヤンク径、１０……バリ抑制ドリル、
Ｄ……切刃間段差、Ｒ……回転方向。 FIG. 1 is a plan view of the tip of one embodiment of the present invention;
FIG. 2 is a diagram showing a conventional example. 1...Main cutting edge, 2...Outer circumference relief, 3...Minor cutting edge, 4...Minor groove, 5...Main groove, 6...Thinning, 7...Shank diameter, 10...Burr suppression drill ,
D...Difference between cutting edges, R...Rotation direction.

補正昭６３．６．２７図面の簡単な説明を次のように補正する。明細書第７頁第１４行目、「７……シヤンク径
」とあるのを「７……加工穴径」と補正します。明細書第７頁第１５行目、「Ｄ……切刃間段差
」とあるのを、「ｄ……切刃間段差」と補正しま
す。Amendment June 27, 1983 The brief description of the drawing is amended as follows. On page 7, line 14 of the specification, "7...shank diameter" should be corrected to "7...machined hole diameter." On page 7, line 15 of the specification, "D... level difference between cutting edges" will be corrected to "d... level difference between cutting edges."

Claims

[Claims for Utility Model Registration] A symmetrically located main cutting edge is provided at the tip of a drill used for hole drilling; A secondary cutting edge with an outer diameter larger than the main cutting edge outer diameter is provided at the outer periphery of the main cutting edge. A burr-suppressing drill characterized by a configuration in which each blade is provided; a minor groove is carved starting between each major cutting edge and the minor cutting edge;